Suppression of electronic correlations by chemical pressure from FeSe to FeS

Abstract

Iron-based chalcogenides are complex superconducting systems in which orbitally-dependent electronic correlations play an important role. Here, using high-resolution angle-resolved photoemission spectroscopy, we investigate the effect of these electronic correlations outside the nematic phase in the tetragonal phase of superconducting FeSe1-xSx (x = 0; 0:18; 1). With increasing sulfur substitution, the Fermi velocities increase significantly and the band renormalizations are suppressed towards a factor of 1.5-2 for FeS. Furthermore, the chemical pressure leads to an increase in the size of the quasi-two dimensional Fermi surface, compared with that of FeSe, however, it remains smaller than the predicted one from first principle calculations for FeS. Our results show that the isoelectronic substitution is an effective way to tune electronic correlations in FeSe1-xSx, being weakened for FeS with a lower superconducting transition temperature. This suggests indirectly that electronic correlations could help to promote higher-Tc superconductivity in FeSe.

arXiv comment4 pages, 3 figures

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• The key ingredients of the electronic structure of FeSe
• Two distinct superconducting pairing states divided by the nematic end point in FeSe${}_{1-x}$S${}_x$
• Highly Anisotropic Superconducting Gap in Nematically Ordered and Tetragonal Phases of FeSe${}_{1-x}$S${}_x$
• Evolution of the Fermi surface of the nematic superconductors FeSe1-xSx
• Quenched nematic criticality separating two superconducting domes in an iron-based superconductor under pressure
• Sixfold enhancement of superconductivity in a tunable electronic nematic system
• Topological Ultranodal pair states in iron-based superconductors
• Correlation between Superconductivity and Magnetic Fluctuations in Fe(Se1-xSx) Revealed by 77Se NMR
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Scattering mechanisms and electrical transport near an Ising nematic quantum critical point
• Pure nematic quantum critical point accompanied by a superconducting dome
• Anomalous high-magnetic field electronic state of the nematic superconductors FeSe${}_{1-x}$S${}_x$
• Orbital mismatch boosting nematic instability in iron-based superconductors
• Correlation strength, Lifshitz transition and the emergence of a two- to three-dimensional crossover in FeSe under pressure
• Two-dome superconductivity in FeS induced by a Lifshitz transition
• Hydrothermal synthesis and complete phase diagram of FeSe${}_{1-x}$S${}_x$ $(0\le x\le 1)$ single crystals
• Growth of superconducting epitaxial films of sulfur substituted FeSe via pulsed laser deposition
• Non-local correlations in Iron Pnictides and Chalcogenides
• Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe
• Signatures of a Quantum Griffiths Phase close to an Electronic Nematic Quantum Phase Transition
• Nematic correlation length in iron-based superconductors probed by inelastic x-ray scattering
• Impact of Nematicity on the Relationship between Antiferromagnetic Fluctuations and Superconductivity in FeSe0.91S0.09 Under Pressure
• Lattice-Shifted Nematic Quantum Critical Point in FeSe${}_{1-x}$S${}_x$
• Close correlation between superconducting transition temperatures and carrier densities in Te- and S-substituted FeSe thin films
• Correlated electronic structure, orbital-dependent correlations, and Lifshitz transition in tetragonal FeS
• FeSe and the missing electron pocket problem
• Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSe${}_{1\text{-}\mathrm{x}}$S${}_{\mathrm{x}}$
• Twisted-bilayer FeSe and the Fe-based superlattices
• Low frequency Raman response near Ising-nematic quantum critical point: a memory matrix approach
• Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe
• ${}^{77}$Se-NMR Study under Pressure on 12%-S Doped FeSe
• Positive and negative chemical pressure effects investigated in electron-doped FeSe films with an electric-double-layer structure
• Unconventional localization of electrons inside of a nematic electronic phase
• Multi-band description of the upper critical field of bulk FeSe
• Interrelationships between nematicity, antiferromagnetic spin fluctuations and superconductivity: Role of hotspots in FeSe${}_{1-x}$S${}_x$ revealed by high pressure ${}^{77}$Se NMR study
• Electronic Stripe Patterns Near the Fermi Level of Tetragonal Fe(Se,S)
• Accurate modeling of FeSe with screened Fock exchange and Hund's metal correlations
• Suppression of Superconductivity and Nematic Order in Fe${}_{1-y}$Se${}_{1-x}$S${}_x$ (0$\le$$x$$\le$1, $y$$\le$0.1) Crystals by Anion Height Disorder
• Microscopic origin of ultranodal superconducting states in spin-1/2 systems
• Laser-induced coherent control of an electronic nematic quantum phase transition
• Observation of a C-type short range antiferromagnetic order in expanded FeS
• Thermoelectricity and electronic correlations enhancement in FeS by slight Se substitution
• Resurgence of superconductivity and the role of $d_{xy}$ hole band in FeSe${}_{1-x}$Te${}_x$
• Sulfur-induced magnetism in FeSe${}_{1-x}$S${}_x$ thin films on LaAlO${}_3$ revealed by muon spin rotation/relaxation
• Defect-induced electronic smectic state at the surface of nematic materials
• Unveiling the quasiparticle behaviour in the pressure-induced high-$T_c$ phase of an iron-chalcogenide superconductor
• Unusual Effects of Be doping in the Iron Based Superconductor FeSe
• Accurate determination of the Fermi surface of tetragonal FeS via quantum oscillation measurements and quasiparticle self-consistent \textit{GW} calculations
• Unusual band splitting and superconducting gap evolution with sulfur substitution in FeSe
• Spin fluctuations in the ultranodal superconducting state of Fe(Se,S)
• Nematic fluctuations mediated superconductivity revealed by anisotropic strain in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Electronic phase diagram of iron chalcogenide superconductors FeSe1-xSx and FeSe1-yTey
• Evolution of charge dynamics in FeSe${}_{1-x}$Te${}_x$: Effects of electronic correlations and nematicity
• Boost of critical current density near quantum critical points in FeSe-Based superconductors with two superconducting domes